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<?php
namespace SMW\Parser;
/**
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class LinksProcessor {
/**
* Internal state for switching SMW link annotations off/on during parsing
* ([[SMW::on]] and [[SMW:off]])
*
* @var boolean
*/
private $isAnnotation = true;
/**
* @var boolean
*/
private $isStrictMode = true;
/**
* Whether a strict interpretation (e.g [[property::value:partOfTheValue::alsoPartOfTheValue]])
* or a more loose interpretation (e.g. [[property1::property2::value]]) for
* annotations is expected.
*
* @since 2.3
*
* @param boolean $isStrictMode
*/
public function isStrictMode( $isStrictMode ) {
$this->isStrictMode = (bool)$isStrictMode;
}
/**
* @since 2.5
*
* @return boolean
*/
public function isAnnotation() {
return $this->isAnnotation;
}
/**
* $smwgLinksInValues (default = false) determines which regexp pattern
* is returned, either a more complex (lib PCRE may cause segfaults if text
* is long) or a simpler (no segfaults found for those, but no links
* in values) pattern.
*
* If enabled (SMW accepts inputs like [[property::Some [[link]] in value]]),
* this may lead to PHP crashes (!) when very long texts are
* used as values. This is due to limitations in the library PCRE that
* PHP uses for pattern matching.
*
* @since 1.9
*
* @param boolean $linksInValues
*
* @return string
*/
public static function getRegexpPattern( $linksInValues = false ) {
if ( $linksInValues ) {
return '/\[\[ # Beginning of the link
(?:([^:][^]]*):[=:])+ # Property name (or a list of those)
( # After that:
(?:[^|\[\]] # either normal text (without |, [ or ])
|\[\[[^]]*\]\] # or a [[link]]
|\[[^]]*\] # or an [external link]
)*) # all this zero or more times
(?:\|([^]]*))? # Display text (like "text" in [[link|text]]), optional
\]\] # End of link
/xu';
}
return '/\[\[ # Beginning of the link
(?:([^:][^]]*):[=:])+ # Property name (or a list of those)
([^\[\]]*) # content: anything but [, |, ]
\]\] # End of link
/xu';
}
/**
* A method that precedes the process method, it takes care of separating
* value and caption (instead of leaving this to a more complex regexp).
*
* @since 1.9
*
* @param array $semanticLink expects (linktext, properties, value|caption)
*
* @return string
*/
public function preprocess( array $semanticLink ) {
$value = '';
$caption = false;
if ( array_key_exists( 2, $semanticLink ) ) {
// #1747 avoid a mismatch on an annotation like [[Foo|Bar::Foobar]]
// where the left part of :: is split and would contain "Foo|Bar"
// hence this type is categorized as no value annotation
if ( strpos( $semanticLink[1], '|' ) !== false ) {
return $semanticLink[0];
}
$parts = explode( '|', $semanticLink[2] );
if ( array_key_exists( 0, $parts ) ) {
$value = $parts[0];
}
if ( array_key_exists( 1, $parts ) ) {
$caption = $parts[1];
}
}
if ( $caption !== false ) {
return [ $semanticLink[0], $semanticLink[1], $value, $caption ];
}
return [ $semanticLink[0], $semanticLink[1], $value ];
}
/**
* Function strips out the semantic attributes from a wiki link.
*
* @since 1.9
*
* @param array $semanticLink expects (linktext, properties, value|caption)
*
* @return string
*/
public function process( array $semanticLink ) {
$valueCaption = false;
$property = '';
$value = '';
if ( array_key_exists( 1, $semanticLink ) ) {
// Use case [[Foo::=Bar]] (:= being the legacy notation < 1.4) where
// the regex splits it into `Foo:` and `Bar` loosing `=` from the value.
// Restore the link to its previous form of `Foo::=Bar` and reapply
// a simple split.
if( strpos( $semanticLink[0], '::=' ) && substr( $semanticLink[1], -1 ) == ':' ) {
list( $semanticLink[1], $semanticLink[2] ) = explode( '::', $semanticLink[1] . ':=' . $semanticLink[2], 2 );
}
// #1252 Strict mode being disabled for support of multi property
// assignments (e.g. [[property1::property2::value]])
// #1066 Strict mode is to check for colon(s) produced by something
// like [[Foo::Bar::Foobar]], [[Foo:::0049 30 12345678]]
// In case a colon appears (in what is expected to be a string without a colon)
// then concatenate the string again and split for the first :: occurrence
// only
if ( $this->isStrictMode && strpos( $semanticLink[1], ':' ) !== false && isset( $semanticLink[2] ) ) {
list( $semanticLink[1], $semanticLink[2] ) = explode( '::', $semanticLink[1] . '::' . $semanticLink[2], 2 );
}
$property = $semanticLink[1];
}
if ( array_key_exists( 2, $semanticLink ) ) {
$value = $semanticLink[2];
}
$value = LinksEncoder::removeLinkObfuscation( $value );
if ( $value === '' ) { // silently ignore empty values
return '';
}
if ( $property == 'SMW' ) {
return $this->setAnnotation( $value );
}
if ( array_key_exists( 3, $semanticLink ) ) {
$valueCaption = $semanticLink[3];
}
// Extract annotations and create tooltip.
$properties = preg_split( '/:[=:]/u', $property );
return [ $properties, $value, $valueCaption ];
}
private function setAnnotation( $value ) {
switch ( $value ) {
case 'on':
$this->isAnnotation = true;
break;
case 'off':
$this->isAnnotation = false;
break;
}
return '';
}
}
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